1NN_WS(7) nanomsg 1.1.5 NN_WS(7)
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6 nn_ws - WebSocket transport mechanism
7
9 #include <nanomsg/nn.h>
10 #include <nanomsg/ws.h>
12
14 The WebSocket transport uses the framing protocol specified in RFC 6455
15 to transport messages. The initial handshake is done using HTTP
16 headers, with the Sec-Websocket-Protocol header set to the SP protocol
17 used by the server. For example, a REQ client will send
18 rep.sp.nanomsg.org.
19 Each SP message is transported in a single WebSocket frame, with no
21 additional data or headers applied. By default this library sends and
22 expects to receive binary frames.
23 When calling either nn_bind() or nn_connect(), omitting the port
25 defaults to the RFC 6455 default port 80 for HTTP. For example,
26 ws://127.0.0.1 is equivalent to ws://127.0.0.1:80
27 WebSocket over TLS is not supported by this library, at this time.
29 URI limitations
31 When calling nn_connect(), the URI may also optionally include the path
32 to a resource and/or query parameters.
33 Example 1. Path and query parameters
35 s1 = nn_socket (AF_SP, NN_PAIR);
37 nn_connect (s1, "ws://example.com/path?query=value");
38 This implementation includes the full path and any query parameters in
40 the HTTP handshake when establishing connections with nn_connect().
41 This information is not available via the nanomsg API afterwards,
42 however.
43 Likewise, this implementation does not examine or use either any path
45 or query parameters that may be supplied to nn_bind(), as it only binds
46 to the TCP port. This implementation acts as a limited HTTP server that
47 offers SP over WebSocket at all URIs for the given TCP address.
48 Applications, however, should not depend on this behavior; intervening
50 infrastructure may proxy, filter or route based on URI, and other
51 implementations of the SP over WebSocket protocol may offer other HTTP
52 services at the same TCP port, utilizing the path, query parameters, or
53 both to determine the service to be used.
54 Socket Options
56 NN_WS_MSG_TYPE
57 This option may be set to NN_WS_MSG_TYPE_TEXT or
58 NN_WS_MSG_TYPE_BINARY. The value of this determines whether data
59 messages are sent as WebSocket text frames, or binary frames, per
60 RFC 6455. Text frames should contain only valid UTF-8 text in their
61 payload, or they will be rejected. Binary frames may contain any
62 data. Not all WebSocket implementations support binary frames. The
63 default is to send binary frames.
64 This option may also be specified as control data when when sending
66 a message with nn_sendmsg().
67 TODO: NN_TCP_NODELAY
69 This option, when set to 1, disables Nagle’s algorithm. It also
70 disables delaying of TCP acknowledgments. Using this option
71 improves latency at the expense of throughput. Type of this option
72 is int. Default value is 0.
73
75 nn_bind (s1, "ws://*:5555");
76 nn_connect (s2, "ws://myserver:5555");
77
79 nn_tcp(7) nn_inproc(7) nn_ipc(7) nn_bind(3) nn_connect(3) nanomsg(7)
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82 Martin Sustrik <sustrik@250bpm.com> Jack R. Dunaway
83 <jack@wirebirdlabs.com> Garrett D’Amore <garrett@damore.org>
84 2021-07-22 NN_WS(7)